Thermostat.



No. 657,359; Patented Sept; 4, |900.

H. 4l. RE-EVE. THERMOSTAT.

(Application tiled Nov. 15, 1899.) (No Model.)

Witneses':

UNrTED 'STATES PATENT Ormea..

HENRY E. REEVE,.OE` NEW YORK, N. Y., ASSIGNOR TO THE AUTOMATIC FIRE ALARM AND EXTINGUISIIER COMPANY, LIMITED, OF SAME PLAGE.

`. THERMOSTAT. I

SPECIFICATION forming part of Letters Patent No. 657.359. dated September 4, 1900 Application tiled November l5, 1899. erial No. 737,027. (tio model-i T @ZZ 1077/0711/ mfG/y ON/067%: companying drawings, forminga part of this 5o Be itknown that I, HENRYE. REEVE, a citispecification, and in Whichzen of the, United States, residing in the cityv Figure 1 is a perspective view ofmy imof NewYork, borough of Brooklyn, county of' proved thermostat with the perforated pro- Kings, and State of New York, have inventedv tecting-cover removed; Eig 2, a vertical seca certain new and useful Improvement in tion with the cover in place, and Fig. 3 asec- 55 Thermostats, of which the following is a detion on the line 3 3 of Fig. 2. scription. In all of the above views corresponding My invention relates to new and useful imparts are represented by the same numerals Io provements in thermostats of Ithe class which of reference.

are now employed in residences, stores, Ware- 1 represents the shell or body in the form 6o houses, 85e., in connection with fire-alarm of a-disk with a downturned rim, as shown, apparatus, such thermostats being adapted said` body heilig made of a single piece of when subjected to a dangerously-high temsheet metal?" Carried within and beneath I5 perature to control a circuit, generally to a the shell 1 are the main elements of the thersignaling apparatus at a central point in the mostat, comprising, essentially, asheet-metal building` in which the thermostat is installed disk 2, having upturned feet 3 3, two disks or elsewhere. It is the general practice to of mica 4 and 5,- one on each side thereof, provide each thermostat with a compound and the plates 6 and 7, which are included 2o bar made of two metals having different coin the circuit. On the upper side of the efiicients of expansion and which when submica disk 4 are washers 8 S of substantially 7o jected to a sufficient temperature will be disthe shape of the main portions of the plates G torted, to control `the desired circuit. Other and 7, (see dottedlines, Eig. 3,) and holding all thermostats are provided with sections of of these elements tightly together are the riv- 25 fusible metal, the melting of which results ets 9 9 of any desired character and number.

in the control of the circuit. These elements are secured in place within My present improvements are applicable to the shell 1 in any suitable way, but preferthermostats employing any desired device for ably by striking the lugs 10 10 up from the cont-rolling the circuit when the temperature feet 3 3 of the disk 2, passing saidlugs through 3o surrounding the thermostathas reached asufopenings l1 in the disk 1, and riveting said ficiently-high point as to Warrant the control lugs over upon the disk 1, as shown. The So of the circuit a necessity. openings in the disk 2 through which the riv- The object of my invention is to provide a ets 9 pass are preferably hushed with insulatthermostat which can be constructed 0very ing material, so that it will be seen that the 35 cheaply, which will be eective in use, and vcontact-plates 6and7 are effectivelyinsulated which will be so perfectly insulated as to from each other, while at the same time such make a short circuit practically impossible, plates will be very iirmly' and rigidly supporteven in the presence of moisture in considered from the shell 1. The plates 6 and 7 are proable quantities. vided with downturned extremities 12 12, in 4o To this end my invention consists of a thereach of which one or more screws 13 are rivetmostat the elements of which are carried by ed,said screws being provided withnuts 14 and 9o and beneathasuitable protecting-shell which, by which the circuit connections to the theras heretofore, may be secured to the ceiling, mostat will be made. The contact-plate 7 is and wherein the insulation of the parts is provided with a downturned arm 15, from 45 effected within the space inclosed by the said which may be carried in any suitable way a shell, whereby the dangers of a short circuit .thermostatic compound bar 16, made of two will be practically overcome. metals having` different eoeflicients of expan- In order that my invention may be better sion, said bar being of a normal curved form, understood, attention is directed to the acas shown. The end of the thermostatic bar 16 cooperates with a screw 17, mounted in the downturned portion 1S of the contact-plate 6, said downtnrned portion being bent back on itself at 19, as shown, so as to offer a better support for the ailjusting-serew 17. Normally the end of the therniostatic bar 16 is out ol contact with the adjusting-screw 17, but when the said bar is subjected to a sulliciently-high temperature it will be distorted and will make contact with the adjustingscrew to control the circuit in the usual way. lnstead ot employing' a thermostatic bar for accomplishing this result any other thermostatic device capable of operation under sutficient heat may be substituted-as, for eX- ample, a strip of fusible metalwhich may connect the contact-plates 6 and 7 and which will be melted, thereby opening a normallyclosed circuit when the temperature reaches a dangerously-high point.

The improved thermostat is provided with the usual cover 20, perforated, as shown, so as to be effectively ventilated, said cover being formed with a central tube 21, which passes through openings in the disk 2 in the mica disks 4- and 5 and in the shell 1, said tube being riveted over upon said shell, as shown.

rlhe improved thermostat may be secured in place by means of a screw passing through the tube 21 and entering the ceiling. Bypassing the tube 21 of the cover 2O through openings in the shell 1 and in the disk 2 the cover will be held much more securely than il the tube Vfor the cover engages an opening in the shell 1 only. In order that the cover 2O may be prevented from being turned to make a short circuit possible through the cover, I provide the tube 21 with a longitudinal groove 22 therein, which groove engages a lug 23, formed in the disk 2, as shown particularly in Fig. 3.

Having now described my invention, what 1 claim as new, and desire to secure by Letters Patent, is as i'ollows:

1. As a new article ol manufacture, an improved thermostatcomprising a shell, a metal disk within said shell having uptnrned feet which are secured to the shell, insulatingdisks carried above and below said metal disk` two contact-plates carried beneath the bol-- tom insulating-disk, rivets passing through the contact-plates, both insulating-disks and the metal disk, and a thermostatic device carried by said contact-plates and arranged to controlan electric circuit when influenced by sufficient change in temperature, substantially as set forth.

2. As a new article of manufacture, an improved thermostat comprising a shell, a metal disk carried by said shell by means of lugs which are struck up from the metal disk and which pass through openings in said shell, an insulating-disk carried below said metal disk and an insulating-disk carried above said metal disk,two contact-plates carried beneath the first insulating -disk, washers carried above the last-mention ed insulating-disk,and rivets passing through said washers, both of the insulating-disks, the metal disk and the contact-plates, integral arms extending down from said contact-plates and with which circuit connections are made, and other arms depending from said contact-plates Vfor carrying a thermostatic device adapted to control an electric circuit when influenced by suilicient change in temperature, substantially as set forth.

This speciilication signed and witnessed th is 3d day ot November, 1899.

HENRY E. REEVE.

lVitn esses:

FRANK L. DYER, JNO. R. TAYLOR. 

